CN110820734A - High-performance combined friction pile structure and construction method - Google Patents

High-performance combined friction pile structure and construction method Download PDF

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Publication number
CN110820734A
CN110820734A CN201911169518.7A CN201911169518A CN110820734A CN 110820734 A CN110820734 A CN 110820734A CN 201911169518 A CN201911169518 A CN 201911169518A CN 110820734 A CN110820734 A CN 110820734A
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China
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pipe
pile
steel
grouting
guide
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CN201911169518.7A
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CN110820734B (en
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韩尚宇
李连国
单凌志
裘德利
李月明
陈慧
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Zhongzi Overseas Consulting Co.,Ltd.
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Jiangxi Bohui Engineering Technology Service Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E02D5/385Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • E02D27/14Pile framings, i.e. piles assembled to form the substructure
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0023Cast, i.e. in situ or in a mold or other formwork

Abstract

The invention relates to a high-performance combined friction pile structure and a construction method, which are characterized in that: a sectional type reinforcing pipe is preset in the pile body reinforcement cage, and a slurry seepage slot hole and a rigid elastic sheet are arranged on the side wall of the sectional type reinforcing pipe; a guide hole guide pipe is arranged on the reinforcement cage, and a lateral support body can be formed around the pile by means of a rear grouting pipe; sinking the steel casing and the annular reinforcement body in a static pressure mode, and controlling the directions of the steel casing and the annular reinforcement body through a guide chute, a directional slide block and a position correcting screw rod; a circumferential cushion block is arranged between the pile body steel reinforcement cage and the steel casing; the annular reinforcement is arranged at the top end of the friction pile, grouting is carried out on a reinforcement grouting pipe of the annular reinforcement, and the annular reinforcement is formed on the outer side of the friction pile; the bearing platform template adopts a concrete precast slab, and the integrity of the friction pile and the bearing platform concrete can be improved through the anchor backing plate and the reinforcing tie bars. The invention can effectively improve the bearing performance of the pile top and the soil body around the pile, improve the integrity of the foundation pile and reduce the construction difficulty.

Description

High-performance combined friction pile structure and construction method
Technical Field
The invention relates to a high-performance combined friction pile structure and a construction method, which can effectively improve the bearing performance of a pile top and soil mass around a pile, improve the integrity of a foundation pile and reduce the construction difficulty, belong to the field of geotechnical engineering and are suitable for friction pile construction engineering.
Background
Friction piles, an important form of foundation piles, have been widely used in various foundation project engineering. From the point of view of the load-bearing properties and failure morphology of foundation piles, the load-bearing capacity of friction piles is significantly affected by the pile circumferential friction resistance and the pile body integrity. Therefore, in engineering design and construction, improvement of the performance of the soil body around the pile and improvement of the bearing capacity of the foundation pile are always important for research.
The friction pile comprises a hollow pipe, tapered pipes communicated with the inside of the hollow pipe are distributed on the periphery of the hollow pipe, overflow holes are distributed on the peripheral pipe wall of the hollow pipe, the position of the pile is measured and set out, then the existing drilling technology is used for pile hole forming on the ground, the hollow pipe with the tapered pipes is hoisted into the pile holes after the hole forming is finished, a reinforcement cage is placed in the hollow pipe, the reinforcement cage is fixed, then grouting and pouring are carried out from the hollow pipe, after the hollow pipe is filled with concrete, one part of the concrete overflows out of the pipe wall through the overflow holes to fill a gap between the outer wall of the hollow pipe and the pile holes to form a concrete tumor block, and the other part of the concrete overflows to fill a gap between the outer wall of the hollow pipe and the pile holes after the tapered pipe is filled. Although the technology is helpful for improving the friction force between the friction pile and the pile hole, the pile body reinforcement cage has low positioning accuracy, the integrity between the pile side rear grouting body and the pile body material is difficult to ensure, and the bearing performance of the pile top soil body is difficult to improve.
In view of this, the present invention is directed to a high-performance combined friction pile structure and a construction method thereof, which can form a pile side reinforcement, a lateral support, and an annular reinforcement at the outer side of a friction pile, and can effectively reduce the difficulty of site construction and improve the efficiency of cushion cap construction and material utilization.
Disclosure of Invention
The invention aims to provide a high-performance combined friction pile structure and a construction method, which can not only form a pile side reinforcement body, a side support body and an annular reinforcement body on the outer side of a friction pile, but also effectively reduce the difficulty of site construction and improve the construction efficiency and the material utilization rate of a bearing platform.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a construction method of a high-performance combined friction pile structure comprises the following construction steps:
1) preparing a pile body reinforcement cage: the pile body reinforcement cage mainly comprises a sectional type reinforcement pipe, a longitudinal reinforcement, a transverse stirrup, a guide positioning ring plate, a leading hole guide pipe and a grouting limit pipe, wherein a pipe cavity filling body consisting of a vertical bag and an elastic ring rib is arranged in the sectional type reinforcement pipe, slurry seepage slotted holes are uniformly distributed at intervals along the length direction of the sectional type reinforcement pipe, a rigid elastic sheet, a first limit ring stay cord, a second limit ring stay cord and an elastic sheet limit ring sleeved on the outer side of the rigid elastic sheet are arranged outside the side wall of the sectional type reinforcement pipe at the slurry seepage slotted hole part, the vertical position of the elastic sheet limit ring is limited by the second limit ring stay cord, and the rigid elastic sheet is attached to and connected with the outer side wall of the sectional type reinforcement pipe; firstly, connecting the top end of a pile body reinforcement cage with a guide positioning ring plate through a ring plate positioning rib; inserting the guide hole guide pipe into a guide pipe penetrating hole on the guide positioning ring plate, enabling the included angle between the axis of the guide hole guide pipe and the vertical line to be 10-30 degrees, and enabling a longitudinal steel bar or a transverse stirrup at the joint of the guide hole guide pipe and the pile body steel reinforcement cage to be welded and connected; the grouting limiting pipe is arranged inside the pile body steel reinforcement cage, the top end of the grouting limiting pipe is connected with the grouting limiting hole in the guide positioning ring plate, and the grouting limiting pipe is connected with the longitudinal steel reinforcement through the transverse connecting rib;
2) and (3) steel casing beating construction: arranging a static pressure support in the pile surrounding soil body of the friction pile, wherein the static pressure support comprises a counter-force beam and a guide support frame, the counter-force beam is arranged at the top end of the guide support, the guide support frame is provided with a guide chute and a position correcting screw rod facing the steel casing side, and the static pressure support is inserted into the pile surrounding soil body of the friction pile; after the steel casing is arranged at the setting position, a connecting beam is arranged at the top end of the steel casing; a hydraulic loader and a pressure dispersion plate are sequentially arranged between the lower surface of the reaction beam and the connecting beam; after the verticality of the steel casing is controlled by the level bubble on the connecting beam, a directional sliding block is arranged between the guide sliding chute and the steel casing; applying a downward pressure to the connecting beam by adopting a hydraulic loader, and controlling the direction of the steel casing by using a directional slide block;
3) pile body steel reinforcement cage installation and location: after the steel casing is arranged, the static pressure support is dismantled; firstly, pressing and injecting a pressure balancing body into a vertical bag, then hoisting a pile body steel reinforcement cage to the pile position of a friction pile, and then arranging an annular cushion block between the pile body steel reinforcement cage and a steel casing; the pile body steel reinforcement cage is synchronously controlled through the steel casing and the annular cushion block in the process of lowering the pile body steel reinforcement cage;
4) and (3) mounting a rear grouting pipe: leading holes into soil around the pile along a leading hole guide pipe by adopting an oblique leading hole device, and synchronously inserting an anti-collapse hole protection pipe in the hole leading process; after the hole leading is finished, inserting a post-grouting pipe into the anti-collapse hole protecting pipe;
5) constructing the pile body concrete, the pile side reinforcing body and the lateral support body: the restraint of the second limiting ring pull rope on the rigid elastic sheet is released, so that the rigid elastic sheet is outwards elastically expanded under the action of elastic force and inserted into the soil body around the pile; inserting a concrete pouring pipe to the bottom end of the pile body reinforcement cage along the grouting limiting pipe, and performing pile body concrete pouring construction of the friction pile; after the pile body concrete pouring construction of the friction pile is completed, firstly removing the pressure balancing body in the vertical bag, then taking out the vertical bag and the anti-collapse hole protection pipe, then respectively carrying out grouting construction on the sectional type reinforcing pipe and the rear grouting pipe, arranging a pile side reinforcing body on the outer side of the sectional type reinforcing pipe, and forming a side supporting body at the bottom end of the rear grouting pipe;
6) and (3) pile circumferential reinforcement construction: after the concrete pouring of the pile body is finished, pulling out the steel pile casing; hoisting an annular reinforcement to the upper part of the friction pile, wherein the annular reinforcement comprises a reinforcement grouting pipe and a connecting steel plate, and the reinforcement grouting pipe and the connecting steel plate are annularly and uniformly arranged at intervals; inserting a grouting pipe limiting bolt into the reinforcing grouting pipe; arranging a lower pressing steel beam on a grouting pipe limiting bolt, arranging a static pressure support in the pile surrounding soil body of the friction pile, and arranging a hydraulic loader and a pressure dispersion plate between a counter-force beam of the static pressure support and the lower pressing steel beam; pressing the annular reinforcement to a set depth through a hydraulic loader, and then pressing slurry into the reinforcing grouting pipe to form an annular reinforcement at the outer side of the friction pile;
7) construction of a pile top bearing platform: after the annular reinforcing body forms the strength, excavating soil around the friction pile, and arranging an anchor backing plate and a reinforcing tie bar at the top end of the friction pile; placing a bearing platform template on the upper part of the friction pile, wherein the bearing platform template comprises two template block bodies which have the same shape and a step-shaped cross section, a cleavage grouting hole is arranged at the position of the changed cross section of the bearing platform template, and the cleavage grouting hole is blocked by a rubber plug; the bearing platform template is limited by the counter-pulling screw rod and the transverse hoop; and after the concrete of the bearing platform is poured, taking down the rubber plug, and carrying out compaction grouting on the concrete of the bearing platform through the cleavage grouting hole.
Further, the segment-type reinforced pipe in the step 1) is made of a steel pipe, the rigid elastic sheet is an elastic steel sheet, and the top end of the rigid elastic sheet is welded and connected with the top end of the slurry seepage slotted hole; two first limiting ring pull ropes are arranged on the suspension steering body in a mirror symmetry manner, and the first limiting ring pull ropes penetrate through the suspension steering body and then are connected with the second limiting ring pull ropes; the plane of the slurry seepage slot hole is rectangular or elliptical; the guide positioning ring plate is formed by rolling a steel plate, a guide pipe penetrating hole with the same axis as the guide pipe of the lead hole and a grouting limiting hole connected with the grouting limiting pipe are arranged on the guide positioning ring plate, and the guide pipe of the lead hole is connected with the guide positioning ring plate through welding or screws; the grouting limiting hole is formed in the circle center of the guide positioning ring plate.
Further, the directional sliding block is vertically welded with the steel casing in the step 2), and a sliding block connecting tenon is arranged at the joint of the directional sliding block and the guide sliding groove; the cross section of the guide sliding chute is U-shaped; the lower surface of the connecting beam is provided with a pile casing limiting groove, and the upper surface of the connecting beam is provided with a level bubble; the position correcting screw rod is connected with the guide support frame through screws, and a connecting arc plate is arranged at the joint of the position correcting screw rod and the outer side wall of the steel casing 15.
Further, the outer diameter of the annular cushion block in the step 3) is the same as the inner diameter of the steel casing, and the inner diameter of the annular cushion block is the same as the outer diameter of the pile body steel reinforcement cage.
Further, the hole collapse prevention protection pipe in the step 4) is a plastic pipe or a steel pipe, and is inserted to the lower part of the steel protection cylinder along the hole guiding pipe;
further, the cross section of the connecting steel sheet in the step 6) is arc-shaped, two ends of the connecting steel sheet are welded with the reinforcing grouting pipe, and 2-3 connecting steel sheets are arranged along the height direction of the reinforcing grouting pipe; a tube cavity filling body consisting of a vertical bag and an elastic annular rib is arranged in the reinforcing grouting pipe.
Further, the post-grouting pipe in the step 4) and the reinforcing grouting pipe in the step 6) are all steel pipes, the bottom end of each steel pipe is provided with a closed end plate, and the side wall of each steel pipe is provided with a grouting hole.
Further, one end of the reinforcing tie bar in the step 7) is anchored into the pile body of the friction pile, and the other end of the reinforcing tie bar is connected with the anchor backing plate through welding or bolts; the bearing platform template is prefabricated by a concrete precast slab, and a flexible airtight body is arranged at the vertical joint of the two template blocks; the size of the inner cross section of the transverse hoop is the same as the outer cross section of the bearing platform template, and a hoop bolt is arranged at a hoop ear plate of the transverse hoop.
The invention also discloses a high-performance combined friction pile structure, which is prepared by the construction method of the high-performance combined friction pile structure.
The present invention has the following features and advantageous effects
(1) The sectional type reinforcing pipe is preset in the pile body reinforcement cage, and the side wall of the sectional type reinforcing pipe is provided with a slurry seepage slot hole which can be used for arranging a pile side reinforcement body; meanwhile, the rigid elastic sheet is arranged on the outer side of the slurry seepage slotted hole, and the deformation of the rigid elastic sheet can be restrained by the second limiting ring pull rope, so that the slurry seepage slotted hole can be prevented from being blocked, and the pile side transverse reinforcement effect can be realized.
(2) According to the invention, the hole guiding guide pipe is arranged on the steel reinforcement cage, and the oblique hole guiding device is adopted to guide holes into the soil body around the pile along the hole guiding guide pipe, so that the accuracy of hole guiding is improved; meanwhile, the invention can form a lateral support body around the pile by means of the rear grouting pipe, and can play the roles of lateral load transfer and pile lateral resistance improvement.
(3) The invention adopts a static pressure mode to sink the steel casing and the annular reinforcement, the guide chute and the position correcting screw rod are arranged on the side of the guide support frame facing the steel casing, the directional slide block is arranged between the guide chute and the steel casing and between the guide chute and the annular reinforcement, the direction of the steel casing and the annular reinforcement is controlled by the directional slide block and the position correcting screw rod, and the sinking direction of the steel casing and the annular reinforcement can be accurately controlled.
(4) According to the invention, the annular cushion block is arranged between the pile body steel reinforcement cage and the steel casing, so that the clear distance between the pile body steel reinforcement cage and the steel casing can be accurately controlled.
(5) The top end of the friction pile is provided with the annular reinforcement, and the annular reinforcement can be formed on the outer side of the friction pile by grouting the reinforcement grouting pipe, so that the aims of restraining the lateral deformation of a soil body at the pile end and hardening the soil body around the pile can be synchronously fulfilled.
(6) The pile cap template comprises two template blocks which have the same shape and have step-shaped cross sections and are prefabricated by a concrete precast slab, so that the difficulty in supporting the pile cap template can be reduced, building materials can be saved, and the integrity of the friction pile and the pile cap concrete can be improved by the anchor backing plate and the reinforcing tie bars.
Drawings
FIG. 1 is a construction flow chart of the high-performance composite friction pile structure of the invention;
FIG. 2 is a schematic longitudinal cross-sectional view of the static pressure mount of the casing of FIG. 1;
FIG. 3 is a schematic view of the connection structure of the directional sliding block and the guide chute in FIG. 2;
fig. 4 is a schematic view of the pile body reinforcement cage of fig. 1;
fig. 5 is a schematic cross-sectional view of the pile body reinforcement cage of fig. 4;
FIG. 6 is a schematic view of the post-grouting pipe of FIG. 1;
FIG. 7 is a schematic view of a static pressure construction of the hoop reinforcement of FIG. 1;
FIG. 8 is a schematic cross-sectional view of the hoop reinforcement of FIG. 7;
FIG. 9 is a schematic view of the reinforced grout tube of FIGS. 7 and 8;
FIG. 10 is a longitudinal cross-sectional view of the shaft of the friction pile of FIG. 1;
fig. 11 is a schematic view of the pile cap template of fig. 1;
fig. 12 is a schematic view of the transverse hoop of fig. 11.
In the figure: 1-pile body reinforcement cage; 2-sectional reinforced pipe; 3-longitudinal steel bars; 4-transverse hooping; 5, guiding and positioning a ring plate; 6-ring plate positioning ribs; 7-leading hole guide tube; 8, perforating a guide pipe; 9-a second limit ring pull rope; 10-a spring plate limiting ring; 11-a rigid spring plate; 12-grouting limit pipes; 13-grouting a limiting hole; 14-transverse connecting ribs; 15-steel casing; 16-friction pile; 17-the soil around the pile; 18-a hydrostatic support; 19-a guide bracket; 20-connecting the cross beam; 21-a reaction beam; 22-a hydraulic loader; 23-a pressure dispersion plate; 24-level bubble; 25-orientation slide block; 26-a guide chute; 27-vertical pouches; 28-a pressure balance; 29-circumferential cushion blocks; 30-anti-collapse hole protecting pipe; 31-post grouting pipe; 32-concrete pouring pipe; 33-pile side reinforcement; 34-lateral support; 35-a hoop reinforcement; 36-pressing down the steel beam; 37-grouting pipe limit bolt; 38-a reinforced slip casting pipe; 39-annular reinforcement; 40-anchor backing plate; 41-reinforcing lacing wire; 42-a cushion cap template; 43-opposite-pull screw; 44-transverse hoop; 45-cushion cap concrete; 46-rubber plug; 47-split grouting holes; 48-slurry bleed slots; 49-a first stop collar pull rope; 50-a suspended steering body; 51-elastic ring rib; 52-lumen obturator; 53-position correcting screw rod; 54-a slide block connecting falcon; 55-protecting barrel limiting groove; 56-connecting the arc plates; 57-connecting steel plates; 58-closed end plate; 59-grouting holes; 60-template block body; 61-a flexible obturator; 62-hoop ear plates; 63-anchor ear bolt.
Detailed Description
Concrete mix proportion design and pouring construction technical requirements, site hoisting construction technical requirements, drill rod hole guiding construction technical requirements, structural steel rolling and welding construction technical requirements, bolt fastening construction technical requirements and the like are omitted in the embodiment, and the embodiment of the structure related to the invention is mainly explained.
Fig. 1 is a construction flow diagram of a high-performance combined friction pile structure of the invention, fig. 2 is a longitudinal section schematic diagram of a pile casing static pressure bracket of fig. 1, fig. 3 is a connection structure schematic diagram of a directional slide block and a guide chute of fig. 2, fig. 4 is a schematic diagram of a pile body reinforcement cage of fig. 1, fig. 5 is a cross section schematic diagram of the pile body reinforcement cage of fig. 4, fig. 6 is a schematic diagram of a rear grouting pipe of fig. 1, fig. 7 is a structural schematic diagram of a hoop reinforcement static pressure construction of fig. 1, fig. 8 is a cross section schematic diagram of a hoop reinforcement of fig. 7, fig. 9 is a schematic diagram of a reinforcement grouting pipe of fig. 7 and fig. 8, fig. 10 is a longitudinal section diagram of the pile body of the friction pile of fig. 1, fig. 11 is. Referring to fig. 1-12, the construction method of the friction pile bearing capacity combined lifting structure comprises the following steps:
1) preparing a pile body reinforcement cage: the pile body reinforcement cage 1 mainly comprises a sectional type reinforcement pipe 2, a longitudinal reinforcement 3, a transverse stirrup 4, a guide positioning ring plate 5, a leading hole guide pipe 7 and a grouting limit pipe 12, wherein the sectional type reinforcement pipe 2 adopts a steel pipe, a pipe cavity filling body 52 consisting of a vertical bag 27 and an elastic ring rib 51 is arranged in the steel pipe, slurry seepage slotted holes 48 are uniformly distributed at intervals along the length direction of the sectional type reinforcement pipe 2, a rigid elastic sheet 11, a first limit ring pull rope 49, a second limit ring pull rope 9 and an elastic sheet limit ring 10 sleeved on the outer side of the rigid elastic sheet 11 are arranged outside the side wall of the sectional type reinforcement pipe 2 at the position of the slurry seepage slotted holes 48, and the vertical position of the elastic sheet limit ring 10 is limited by the second limit ring pull rope 9, so that the rigid elastic sheet 11 is attached to the outer side wall of the sectional type reinforcement; (ii) a Firstly, connecting the top end of a pile body reinforcement cage 1 with a guide positioning ring plate 5 through a ring plate positioning rib 6; inserting a guide hole guide pipe 7 into a guide pipe penetrating hole 8 on a guide positioning ring plate 5 to enable an included angle between the axis of the guide hole guide pipe and a vertical line to be 10-30 degrees, and welding and connecting the guide hole guide pipe 7 with a longitudinal steel bar 3 or a transverse stirrup 4 at the joint of a pile body steel reinforcement cage 1; the grouting limit pipe 12 is arranged inside the pile body steel reinforcement cage body, the top end of the grouting limit pipe is connected with a grouting limit hole 13 on the guide positioning ring plate 5, and is connected with the longitudinal steel bar 3 through a transverse connecting rib 14;
2) and (3) steel casing beating construction: arranging a static pressure support 18 in the pile surrounding soil body 17 of the friction pile 16, wherein the static pressure support 18 comprises a reaction beam 21 and a guide support frame 19, the reaction beam 21 is arranged at the top end of the guide support frame 19, the guide support frame 19 is provided with a guide chute 26 and a position correcting screw 53 facing the steel casing 15 side, and the static pressure support 18 is inserted into the pile surrounding soil body 17 of the friction pile 16; after the steel casing 15 is arranged at the setting position, a connecting beam 20 is arranged at the top end of the steel casing 15; a hydraulic loader 22 and a pressure dispersion plate 23 are sequentially arranged between the lower surface of the reaction beam 21 and the connecting beam 20; after the verticality of the steel casing 15 is controlled by the level bubble 24 on the connecting beam 20, a directional slider 25 is arranged between the guide chute 26 and the steel casing 15; applying a downward pressure to the connecting beam 20 by using a hydraulic loader 22, and controlling the direction of the steel casing 15 by using a directional slide block 25;
3) pile body steel reinforcement cage installation and location: after the steel casing 15 is arranged, the static pressure support 18 is removed; firstly, pressing and injecting a pressure balancing body 28 into a vertical bag 27, then hoisting the pile body steel reinforcement cage 1 to the pile position of the friction pile 16, and then arranging an annular cushion block 29 between the pile body steel reinforcement cage 1 and the steel casing 15; in the process of lowering the pile body reinforcement cage 1, the pile body reinforcement cage 1 is synchronously controlled through the steel casing 15 and the annular cushion block 29;
4) and (3) mounting a rear grouting pipe: guiding holes into the pile soil body 17 along the guide hole guide pipe 7 by adopting an oblique hole guiding device, and synchronously inserting the anti-collapse hole protection pipe 30 in the hole guiding process; after the hole leading is finished, inserting a rear mud jacking pipe 31 into the anti-collapse hole protecting pipe 30;
5) constructing the pile body concrete, the pile side reinforcing body and the lateral support body: the constraint of the second spacing ring pull rope 9 on the rigid elastic sheet 11 is firstly released, so that the rigid elastic sheet 11 is outwards elastically expanded under the action of elastic force and is inserted into the soil body 17 around the pile; inserting the concrete pouring pipe 32 to the bottom end of the pile body reinforcement cage 1 along the grouting limiting pipe 12, and performing pile body concrete pouring construction of the friction pile 16; after the concrete pouring construction of the pile body of the friction pile 16 is completed, firstly removing the pressure balancing body 28 in the vertical bag 27, then taking out the vertical bag 27 and the anti-collapse hole protecting pipe 30, then respectively carrying out grouting construction on the sectional type reinforcing pipe 2 and the rear grouting pipe 31, arranging a pile side reinforcing body 33 at the outer side of the sectional type reinforcing pipe 2, and forming a side supporting body 34 at the bottom end of the rear grouting pipe 31;
6) and (3) pile circumferential reinforcement construction: after the concrete pouring of the pile body is finished, the steel casing 15 is pulled out; firstly hoisting an annular reinforcement body 35 to the upper part of the friction pile 16, wherein the annular reinforcement body 35 comprises a reinforcement grouting pipe 38 and a connecting steel plate 57, and the reinforcement grouting pipe 38 and the connecting steel plate 57 are arranged at intervals at uniform intervals in an annular shape; inserting the grouting pipe limit bolt 37 into the reinforcing grouting pipe 38; arranging a lower pressing steel beam 36 on a grouting pipe limiting bolt 37, arranging a static pressure support 18 in a pile surrounding soil body 17 of the friction pile 16, and arranging a hydraulic loader 22 and a pressure dispersion plate 23 between a counter-force beam 21 of the static pressure support 18 and the lower pressing steel beam 36; after the annular reinforcing body 35 is pressed to a set depth by the hydraulic loader 22, grouting is carried out in the reinforcing grouting pipe 38, and an annular reinforcing body 39 is formed outside the friction pile 16;
7) construction of a pile top bearing platform: after the annular reinforcement 39 forms the strength, the soil 17 around the friction pile 16 is dug, and an anchor backing plate 40 and a reinforcement tie bar 41 are arranged at the top end of the friction pile 16; placing a bearing platform template 42 on the upper part of the friction pile 16, wherein the bearing platform template 42 comprises two template block bodies 60 which have the same shape and are step-shaped in cross section, a splitting grouting hole 47 is arranged at the position where the cross section of the template block bodies is changed, and the splitting grouting hole 47 is blocked by a rubber plug 46; the bearing platform template 42 is limited by a pull screw 43 and a transverse hoop 44; after the concrete 45 is poured into the bearing platform, the rubber plug 46 is removed, and the concrete 45 is compacted and grouted through the splitting grouting hole 47.
The sectional type reinforcing pipe 2 in the step 1) is made of a steel pipe, the rigid elastic sheet 11 is an elastic steel sheet, and the top end of the rigid elastic sheet is welded and connected with the top end of the slurry seepage slotted hole 48; two first limit ring pull ropes 49 are arranged on the suspension steering body 50 in a mirror symmetry manner, and the first limit ring pull ropes 49 penetrate through the suspension steering body 50 and then are connected with the second limit ring pull rope 9; the plane of the slurry seepage slot 48 is rectangular or elliptical; the guide positioning ring plate 5 is formed by rolling a steel plate, a guide pipe penetrating hole 8 with the same axis as the guide pipe 7 of the guide hole and a grouting limiting hole 13 connected with a grouting limiting pipe 12 are arranged on the guide positioning ring plate, and the guide pipe 7 of the guide hole is connected with the guide positioning ring plate 5 through welding or screws; the grouting limiting hole 13 is formed in the circle center of the guide positioning ring plate 5.
In the step 2), the directional slide block 25 is vertically welded with the steel casing 15, and a slide block connecting tenon 54 is arranged at the joint of the directional slide block 25 and the guide sliding groove 26; the cross section of the guide chute 26 is U-shaped; the lower surface of the connecting beam 20 is provided with a casing limiting groove 55, and the upper surface is provided with a leveling bubble 24; the position correcting screw rod 53 is connected with the guide support frame 19 through a screw, and a connecting arc plate 56 is arranged at the joint of the position correcting screw rod and the outer side wall of the steel casing 15.
In the step 3), the outer diameter of the annular cushion block 29 is the same as the inner diameter of the steel casing 15, and the inner diameter of the annular cushion block is the same as the outer diameter of the pile body reinforcement cage 1.
In the step 4), the anti-collapse hole protection pipe 30 is made of a plastic pipe or a steel pipe and is inserted to the lower part of the steel protection cylinder 15 along the guide hole guide pipe 7;
the cross section of the connecting steel sheet in the step 6) is arc-shaped, two ends of the connecting steel sheet are welded with the reinforcing grouting pipe 38, and 2-3 connecting steel sheets are arranged along the height direction of the reinforcing grouting pipe 38; a lumen obturator 52 consisting of a vertical bladder 27 and an elastic annular bead 51 is disposed within the stiffening slip casting 38.
The rear grouting pipe 31 in the step 4) and the reinforcing grouting pipe 38 in the step 6) are both steel pipes, the bottom ends of the reinforcing grouting pipes are provided with closed end plates 58, and the side walls of the reinforcing grouting pipes are provided with grouting holes 59.
In the step 7), one end of the reinforcing tie bar 41 is anchored into the pile body of the friction pile 16, and the other end of the reinforcing tie bar is connected with the anchor backing plate 40 through welding or bolts; the bearing platform template 42 is prefabricated by concrete precast slabs, and a flexible airtight body 61 is arranged at the vertical joint of the two template blocks 60; the inner section of the transverse hoop 44 is the same as the outer section of the bearing platform template 42, and a hoop bolt 63 is arranged at a hoop ear plate 62 of the transverse hoop 44.
Example 1: a sectional type reinforcing pipe 2 is preset in the pile body reinforcement cage 1, and a slurry seepage slot 48 and a rigid elastic sheet 11 are arranged on the side wall of the sectional type reinforcing pipe 2; a guide hole guide pipe 7 is arranged on the pile body reinforcement cage 1, and a lateral support body 34 can be formed on the periphery of the pile by means of a rear grouting pipe 31; the steel casing 15 and the annular reinforcement 35 are sunk in a static pressure mode, and the directions of the steel casing 15 and the annular reinforcement 35 are controlled through the guide chute 26, the directional slide block 25 and the position correcting screw 53; a circumferential cushion block 29 is arranged between the pile body reinforcement cage 1 and the steel casing 15; arranging a ring-shaped reinforcement 35 at the top end of the friction pile 16, and forming a ring-shaped reinforcement 39 outside the friction pile 16 by grouting a reinforcing grouting pipe 38; the bearing platform template 42 is made of concrete precast slabs, and the integrity of the friction pile 16 and the bearing platform concrete 45 can be improved through the anchor backing plate 40 and the reinforcing tie bars 41.
The pile body reinforcement cage 1 comprises a sectional type reinforcement pipe 2, a longitudinal reinforcement 3 and a transverse stirrup 4, wherein the sectional type reinforcement pipe 2 is a steel pipe with the diameter of 6cm, and the wall thickness is 2 mm; the longitudinal steel bar 3 is a twisted steel bar with the diameter of 25 mm; the transverse stirrups 4 adopt twisted steel bars with the diameter of 12 mm.
The guide positioning ring plate 5 is formed by rolling a steel plate with the strength grade of Q235B and the thickness of 1 cm. The ring plate positioning ribs 6 are threaded reinforcing steel bars with the diameter of 12 mm.
The guide hole guide pipe 7 is a PVC pipe with the outer diameter of 125mm, and the guide hole guide pipe 7 is inserted into the guide pipe penetrating hole 8, so that the included angle between the axis of the guide hole guide pipe and the vertical line is 10-30 degrees; the guide pipe through hole 8 is matched with the guide hole guide pipe 7.
The second limit ring pull rope 9 and the first limit ring pull rope 49 both adopt nylon ropes with the diameter of 6 mm.
The elastic sheet limiting ring 10 is rolled by adopting a steel wire with the diameter of 2mm to be annularly sleeved on the outer side of the rigid elastic sheet 11;
the rigid elastic sheet 11 is made of SK5 elastic steel sheet.
The grouting limiting pipe 12 is a steel pipe with the outer diameter of 30cm and the wall thickness of 1 mm; the plane size of the grouting limit hole 13 is matched with the size of the grouting limit pipe 12, the grouting limit hole is arranged at the circle center of the guide positioning ring plate 5, and the axis is the same as the axis of the friction pile 16.
The transverse connecting rib 14 is a threaded steel bar with the diameter of 12 mm.
The steel casing 15 is rolled by a steel plate with the strength grade of Q235B and the thickness of 2mm, and the inner diameter is 1000 mm.
The friction pile 16 is cast with C35 concrete.
The soil body 17 around the pile is cohesive soil in a hard plastic state.
The static pressure support 18 consists of a guide support frame 19 and a counter-force beam 21; the strength grade of the guide bracket 19 is Q235, and H-shaped steel with the specification of 200 multiplied by 8 multiplied by 12 is adopted; the reaction beam 21 is made of H-shaped steel having a strength class of Q235 and a specification of 150 × 150 × 7 × 10.
The connecting beam 20 and the lower steel pressing beam 36 are both made of H-shaped steel with the strength grade of Q235 and the size of 100 × 100 × 6 × 8.
The hydraulic loader 22 uses an oil jack with a range of 200kN and a stroke of 200 mm.
The pressure dispersion plate 23 is formed by rolling a steel plate with the strength grade of Q235 and the thickness of 2 mm.
The level vial 24 is a high-precision level vial.
The directional sliding block 25 is vertically welded with the steel protective cylinder 15, a sliding block connecting tenon 54 is arranged at the joint of the directional sliding block 25 and the guide sliding groove 26, wherein the directional sliding block 25 is formed by rolling a steel plate with the thickness of 2mm, and the width of the directional sliding block is 4 cm; the guide chute 26 is formed by rolling a steel plate with the thickness of 2cm, the width of the guide chute is 5cm, and the cross section of the guide chute is U-shaped; the width of the slide block connecting falcon 54 is 8cm, and the slide block connecting falcon is vertically welded and connected with the directional slide block 25.
The lumen filling body 52 consists of a vertical bag 27 and an elastic ring rib 51, wherein the vertical bag 27 is formed by sewing rubber sheets with the thickness of 1mm, and the diameter of the vertical bag is 6 cm; the elastic ring rib 51 is connected with the vertical bag 27 by sewing by a spring with the diameter of 4 mm.
Tap water is used as the pressure-balancing body 28.
The annular cushion block 29 is made of a rubber plate with the thickness of 3cm, the outer diameter of the annular cushion block is the same as the inner diameter of the steel casing 15, and the inner diameter of the annular cushion block is the same as the outer diameter of the pile body steel reinforcement cage 1.
The anti-collapse hole protection pipe 30 is a steel pipe with the outer diameter of 10cm, and is inserted to the lower part of the steel protection cylinder 15 along the guide hole guide pipe 7.
The rear grouting pipe 31 and the reinforcing grouting pipe 38 are both steel pipes, the bottom ends of the rear grouting pipes are provided with closed end plates 58, and the side walls of the rear grouting pipes are provided with grouting holes 59; the closed end plate 58 is a steel plate with the thickness of 2mm and is welded with the rear grouting pipe 31 and the reinforcing grouting pipe 38; the mud jacking holes 59 are rectangular, 1cm in width and 2cm in length.
The concrete pouring pipe 32 is a steel pipe with a diameter of 20 cm.
The pile-side reinforcing body 33 is formed by grouting the segment-type reinforcing pipe 2, and the concrete is fine-grained concrete having a strength grade of C35.
The lateral support 34 is formed by internally grouting the rear grout pipe 31 with fine stone concrete having a strength grade of C35.
The annular reinforcement body 35 comprises a reinforcement grouting pipe 38 and a connecting steel plate 57, the reinforcement grouting pipe 38 and the connecting steel plate 57 are arranged at intervals in an annular shape, the connecting steel plate 57 is formed by rolling a steel plate with the thickness of 2mm, the cross section of the connecting steel plate is in an arc shape, and 3 channels are arranged along the height direction of the reinforcement grouting pipe 38; the reinforcing slip casting 38 is a steel pipe with a diameter of 60mm and a wall thickness of 2 mm.
The grouting pipe limiting bolt 37 is formed by rolling a steel plate with the thickness of 2 mm.
The annular reinforcement 39 is formed by pressing a slurry, which is fine-grained concrete having a strength grade of C35, into the reinforcing slip pipe 38.
The anchor backing plate 40 is formed by rolling a steel plate with the thickness of 2cm, and the plane diameter is 10 cm.
The reinforcing tie bar 41 is a threaded steel bar with a diameter of 25mm, one end of the reinforcing tie bar is anchored into the pile body of the friction pile 16, and the other end of the reinforcing tie bar is connected with the anchor backing plate 40 in a welding mode.
The cushion cap template 42 comprises two template block bodies 60 with the same shape and a step-shaped cross section; the formwork block 60 is prefabricated by concrete with the strength grade of C35, and the thickness is 8 cm.
The counter-pulling screw 43 is composed of a screw and a bolt with a diameter of 20 mm.
The inner section size of the transverse hoop 44 is the same as the outer section of the cushion cap template 42, and a hoop bolt 63 is arranged at a hoop ear plate 62 of the transverse hoop 44; wherein the hoop ear plate 62 is made of a steel plate with the thickness of 2mm and the width of 6 cm; the anchor ear bolt 63 is a stainless steel bolt with the diameter of 20 mm.
The cap concrete 45 is C35 concrete.
The splitting grouting hole 47 is a circular hole with the diameter of 6 cm; the rubber plug 46 is made of rubber material and has a size matched with that of the splitting grouting hole 47.
Slurry bleed slot 48 the slurry bleed slot is rectangular, 2cm wide and 4cm long.
The suspension steering body 50 adopts a U-shaped groove wheel covered with a plastic bearing.
The position correcting screw 53 is a stainless steel screw with a diameter of M30.
The plane size of the pile casing limiting groove 55 is matched with the size of the steel pile casing 15.
The connecting arc plate 56 is formed by rolling a steel plate with the thickness of 2mm and is connected with the position correcting screw 53 through a bolt.
The flexible obturator 61 is a rubber strip with a thickness of 1 cm.

Claims (9)

1. A construction method of a high-performance combined friction pile structure is characterized by comprising the following construction steps:
1) preparing a pile body reinforcement cage: the pile body reinforcement cage (1) mainly comprises a sectional type reinforcing pipe (2), a longitudinal reinforcement (3), a transverse stirrup (4), a guide positioning ring plate (5), a lead hole guide pipe (7) and a grouting limit pipe (12), the section type reinforced pipe (2) adopts a steel pipe, the inside of the steel pipe is provided with a pipe cavity filling body (52) consisting of a vertical bag (27) and an elastic ring rib (51), slurry seepage slotted holes (48) are uniformly distributed at intervals along the length direction of the steel pipe, a rigid elastic sheet (11), a first limit ring pull rope (49), a second limit ring pull rope (9) and an elastic sheet limit ring (10) sleeved outside the rigid elastic sheet (11) are arranged outside the side wall of the segment type reinforced pipe (2) at the position of the slurry seepage slot hole (48), the vertical position of the elastic sheet limiting ring (10) is limited through a second limiting ring pull rope (9), so that the rigid elastic sheet (11) is attached to and connected with the outer side wall of the sectional type reinforcing pipe (2); firstly, the top end of a pile body reinforcement cage (1) is connected with a guide positioning ring plate (5) through a ring plate positioning rib (6); inserting a guide hole guide pipe (7) into a guide pipe penetrating hole (8) on a guide positioning ring plate (5) to enable an included angle between the axis of the guide hole guide pipe and a vertical line to be 10-30 degrees, and enabling the guide hole guide pipe (7) to be in welded connection with a longitudinal steel bar (3) or a transverse stirrup (4) connected with a pile body steel bar cage (1); the grouting limiting pipe (12) is arranged inside the pile body steel reinforcement cage (1), the top end of the grouting limiting pipe is connected with a grouting limiting hole (13) on the guide positioning ring plate (5), and is connected with the longitudinal steel reinforcement (3) through a transverse connecting rib (14);
2) and (3) steel casing beating construction: a static pressure support (18) is arranged in a pile surrounding soil body (17) of the friction pile (16), and the static pressure support (18) comprises a counter-force cross beam (21) and a guide support frame (19); the reaction beam (21) is arranged at the top end of the guide support frame (19); the guide support frame (19) is provided with a guide chute (26) and a position correcting screw rod (53) facing the steel casing (15), and the static pressure support (18) is inserted into a pile surrounding soil body (17) of the friction pile (16); after the steel casing (15) is arranged at a set position, a connecting beam (20) is arranged at the top end of the steel casing (15); a hydraulic loader (22) and a pressure dispersion plate (23) are sequentially arranged between the lower surface of the reaction beam (21) and the connecting beam (20); after the verticality of the steel casing (15) is controlled by a level bubble (24) on the connecting beam (20), a directional slider (25) is arranged between the guide chute (26) and the steel casing (15); applying a downward pressure on the connecting beam (20) by using a hydraulic loader (22), and controlling the direction of the steel casing (15) by using a directional slide block (25);
3) pile body steel reinforcement cage installation and location: after the steel casing (15) is arranged, the static pressure support (18) is removed; firstly, pressing and injecting a pressure balancing body (28) into a vertical bag (27), then hoisting the pile body steel reinforcement cage (1) to the pile position of the friction pile (16), and then arranging a circumferential cushion block (29) between the pile body steel reinforcement cage (1) and the steel casing (15); the pile body steel reinforcement cage (1) is synchronously controlled through a steel casing (15) and a circumferential cushion block (29) in the process of lowering the pile body steel reinforcement cage (1);
4) and (3) mounting a rear grouting pipe: an oblique hole guiding device is adopted to guide holes into the soil body (17) around the pile along a hole guiding guide pipe (7), and a hole collapse preventing protection pipe (30) is synchronously inserted in the hole guiding process; after the hole leading is finished, inserting a rear mud jacking pipe (31) into the anti-collapse hole protecting pipe (30);
5) constructing the pile body concrete, the pile side reinforcing body and the lateral support body: the constraint of the second spacing ring pull rope (9) on the rigid elastic sheet (11) is firstly released, so that the rigid elastic sheet (11) is outwards elastically expanded under the action of elastic force and is inserted into the soil body (17) around the pile; inserting a concrete pouring pipe (32) to the bottom end of the pile body reinforcement cage (1) along the grouting limiting pipe (12) to carry out pile body concrete pouring construction of the friction pile (16); after the pile body concrete pouring construction of the friction pile (16) is completed, firstly removing a pressure balancing body (28) in a vertical bag (27), then taking out the vertical bag (27) and an anti-collapse hole protecting pipe (30), then respectively carrying out grouting construction on a sectional type reinforcing pipe (2) and a rear grouting pipe (31), arranging a pile side reinforcing body (33) at the outer side of the sectional type reinforcing pipe (2), and forming a side supporting body (34) at the bottom end of the rear grouting pipe (31);
6) and (3) pile circumferential reinforcement construction: after the concrete pouring of the pile body is finished, the steel pile casing (15) is pulled out; firstly hoisting an annular reinforcement body (35) to the upper part of the friction pile (16), wherein the annular reinforcement body (35) comprises a reinforcement grouting pipe (38) and a connecting steel plate (57), and the reinforcement grouting pipe (38) and the connecting steel plate (57) are annularly and uniformly arranged at intervals; then inserting a grouting pipe limiting bolt (37) into the reinforcing grouting pipe (38); a pressing steel beam (36) is arranged on a grouting pipe limiting bolt (37), a static pressure support (18) is arranged in a pile surrounding soil body (17) of the friction pile (16), and a hydraulic loader (22) and a pressure dispersion plate (23) are arranged between a counter-force cross beam (21) of the static pressure support (18) and the pressing steel beam (36); pressing the annular reinforcement (35) to a set depth by a hydraulic loader (22), and then pressing slurry into a reinforcing grouting pipe (38) to form an annular reinforcement (39) outside the friction pile (16);
7) construction of a pile top bearing platform: after the annular reinforcement body (39) forms the strength, excavating the soil body (17) around the friction pile (16), and arranging an anchor backing plate (40) and a reinforcement tie bar (41) at the top end of the friction pile (16); placing a bearing platform template (42) on the upper part of the friction pile (16), wherein the bearing platform template (42) comprises two template block bodies (60) which have the same shape and a step-shaped cross section, a splitting grouting hole (47) is arranged at the position where the cross section of the template block bodies changes, and the splitting grouting hole (47) is blocked by a rubber plug (46); the bearing platform template (42) is limited by a counter-pulling screw rod (43) and a transverse hoop (44); and after the concrete (45) of the bearing platform is poured, taking down the rubber plug (46), and carrying out compaction grouting on the concrete (45) of the bearing platform through the splitting grouting hole (47).
2. The construction method of the high-performance combined friction pile structure according to claim 1: the method is characterized in that: in the step 1), the sectional type reinforcing pipe (2) is made of a steel pipe, the rigid elastic sheet (11) is an elastic steel sheet, and the top end of the rigid elastic sheet is welded and connected with the top end of the slurry seepage slotted hole (48); two first limiting ring pull ropes (49) are arranged on the suspension steering body in a mirror symmetry manner, and the first limiting ring pull ropes (49) penetrate through the suspension steering body (50) and then are connected with the second limiting ring pull rope (9); the plane of the slurry seepage slot hole (48) is rectangular or elliptical; the guide positioning ring plate (5) is formed by rolling a steel plate, a guide pipe penetrating hole (8) which is the same as the axis of the hole guiding pipe (7) and a grouting limiting hole (13) connected with the grouting limiting pipe (12) are arranged on the guide positioning ring plate, and the hole guiding pipe (7) is connected with the guide positioning ring plate (5) through welding or screws; the grouting limiting hole (13) is formed in the circle center of the guide positioning ring plate (5).
3. The construction method of the high-performance combined friction pile structure according to claim 1: the method is characterized in that: in the step 2), the directional slide block (25) is vertically welded with the steel protective cylinder (15), and a slide block connecting tenon (54) is arranged at the joint of the directional slide block and the guide sliding groove (26); the cross section of the guide chute (26) is U-shaped; the lower surface of the connecting beam (20) is provided with a pile casing limiting groove (55), and the upper surface is provided with a leveling bubble (24); the position correcting screw rod (53) is connected with the guide support frame (19) through a screw, and a connecting arc plate (56) is arranged at the joint of the position correcting screw rod and the outer side wall of the steel casing (15).
4. The construction method of the high-performance combined friction pile structure according to claim 1: the method is characterized in that: in the step 3), the outer diameter of the annular cushion block (29) is the same as the inner diameter of the steel casing (15), and the inner diameter of the annular cushion block is the same as the outer diameter of the pile body reinforcement cage (1).
5. The construction method of the high-performance combined friction pile structure according to claim 1: the method is characterized in that: in the step 4), the anti-collapse hole protection pipe (30) is a plastic pipe or a steel pipe and is inserted to the lower part of the steel protection cylinder (15) along the hole guiding guide pipe (7).
6. The construction method of the high-performance combined friction pile structure according to claim 1, characterized in that: the cross section of the connecting steel sheet in the step 6) is arc-shaped, two ends of the connecting steel sheet are welded with the reinforcing grouting pipe (38), and 2-3 connecting steel sheets are arranged along the height direction of the reinforcing grouting pipe (38); a lumen filling body (52) consisting of a vertical sac (27) and an elastic ring rib (51) is arranged in the reinforcing grouting pipe (38).
7. The construction method of the high-performance combined friction pile structure according to claim 1, characterized in that: the rear grouting pipe in the step 4) and the reinforcing grouting pipe in the step 6) are all steel pipes, the bottom end of each steel pipe is provided with a closed end plate (58), and the side wall of each steel pipe is provided with a grouting hole (59).
8. The construction method of the high-performance combined friction pile structure according to claim 1, characterized in that: in the step 7), one end of the reinforcing tie bar (41) is anchored into the pile body of the friction pile (16), and the other end of the reinforcing tie bar is connected with the anchor backing plate (40) through welding or bolts; the bearing platform template (42) is prefabricated by concrete precast slabs, and a flexible airtight body (61) is arranged at the vertical joint of the two template blocks (60); the inner section size of the transverse hoop (44) is the same as the outer section of the bearing platform template (42), and a hoop bolt (63) is arranged at a hoop ear plate (62) of the transverse hoop (44).
9. A high-performance combined friction pile structure, which is prepared by the construction method of the high-performance combined friction pile structure according to any one of claims 1 to 8.
CN201911169518.7A 2019-11-26 2019-11-26 High-performance combined friction pile structure and construction method Active CN110820734B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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CN110424380A (en) * 2019-08-09 2019-11-08 倡创(上海)咨询管理事务所 The accurate guide construction method of cast-in-situ bored pile

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Publication number Priority date Publication date Assignee Title
CN101126239A (en) * 2007-09-14 2008-02-20 张立军 Construction device and construction technique for concrete pipe base
JP5192346B2 (en) * 2007-12-27 2013-05-08 株式会社間組 Pile head processing method
CN110016909A (en) * 2019-04-26 2019-07-16 江苏长江机械化基础工程有限公司 Hydraulic squeezed joint pouch slip casting pile body expands reinforcement bored pile construction method
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Publication number Priority date Publication date Assignee Title
CN111270668A (en) * 2020-02-27 2020-06-12 深圳市粤通建设工程有限公司 Engineering pile based on recycled aggregate seawater sea sand FPR composite material rib
CN111270668B (en) * 2020-02-27 2021-10-01 深圳市粤通建设工程有限公司 Engineering pile based on recycled aggregate seawater sea sand FPR composite material rib

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